* Change default output format to parsable
`github` format is barely usable in the logs where it only shows that errors/warnings occurred but not which file:line.
* Update README.md
Add wf to autotag minor and patch releases
By default use Dockerfile rather than docker image,
obviously is slower by ~15 sec which consumes precious
runner minutes but harder to automate releases, tagging and
updating image reference in action.yaml
thou not impossible. Next time.